Games like 2021
Games like 2021 include Zup! S, Plants vs. Zombies GOTY Edition, BEEP, Scribblenauts Unlimited, and Peggle Deluxe. We matched them by the tags players give 2021 on Steam (Strategy, Casual, Puzzle, Singleplayer, and Adventure): closest matches first, and among equally close ones the better-known games.

Zup! S
Shared: Casual · Puzzle · Singleplayer

Plants vs. Zombies GOTY Edition
Shared: Strategy · Casual · Singleplayer

BEEP
Shared: Adventure · Singleplayer · Puzzle

Scribblenauts Unlimited
Shared: Casual · Puzzle · Adventure

Peggle Deluxe
Shared: Casual · Puzzle · Singleplayer

Mini Metro
Shared: Strategy · Puzzle · Casual

Zup!
Shared: Casual · Puzzle · 2D

There Is No Game: Wrong Dimension
Shared: Puzzle · Adventure · Casual

Tiny Bridge: Ratventure
Shared: Casual · Puzzle · Strategy

The Basement Collection
Shared: Strategy · Adventure · Singleplayer

Moncage
Shared: Casual · Puzzle · Singleplayer

Hexcells
Shared: Casual · Puzzle · Strategy

Bridge Constructor Portal
Shared: Strategy · Puzzle · Singleplayer

Kingdom Rush - Tower Defense
Shared: Strategy · Singleplayer · Casual

Chants of Sennaar
Shared: Puzzle · Singleplayer · Adventure

Monument Valley
Shared: Puzzle · Casual · Singleplayer

Mini Motorways
Shared: Strategy · Casual · Puzzle

Zup! 2
Shared: Casual · Puzzle · 2D

Zup! 3
Shared: Casual · Puzzle · 2D

Game Dev Tycoon
Shared: Strategy · Casual · Singleplayer

Gorogoa
Shared: Puzzle · Singleplayer · Casual

12 Labours of Hercules
Shared: Strategy · Casual · Puzzle

Donut County
Shared: Casual · Puzzle · Adventure

Death Coming/死神来了
Shared: Casual · Strategy · Puzzle